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While Nelson is at his institute, a sudden power overload destroys the Seaview with all hands. Mr. Pem (time traveller from the episode "A Time to Die") approaches Nelson with an offer to go back in time and prevent the incident. Nelson agrees, only to find his ship and crew transported to the eighteenth century, where Mr. Pem plans to alter the outcome of the Revolutionary War.
The Seaview is en route to rendezvous with the fleet when Sharkey reports a missile fuel leak. Crane and Morton believe it's worth returning to port to repair, however Nelson knows how to handle it. Taking a small breathing device with him, the Admiral locks himself in the compartment in question to effect repairs. However, he drops a wrench, the circuits blow and Nelson is knocked out. When he comes to, he's gripped by paranoia which worsens with each passing minute. Trusting no one, Nelson loses his grip on reality, arresting Doc, fighting with Sharkey and finally launching a nuclear missile at the fleet!
An alien creature that can exist either as pure energy or a strange-looking orchid plant, plots to take over the world. Wanting the Seaview as an ideal environment in which to reproduce itself, it takes control of Admiral Nelson.
A man from the future sends two androids back in time to kidnap Nelson from Seaview in order to add him to a collection of other famous military figures abducted from various eras of the past.
Doctor Blanchard has created a device to control the actions of a white gorilla. Unfortunately, his assistant Leo Brock wants the fame that the inventor of such a device would gain. As a result he uses the device to enrage the gorilla and kill Blanchard. Nelson gets there too late to save Blanchard, but the gorilla is taken on board. Brock sets the gorilla free and he runs amock until both Brock and the gorilla are killed.
The Seaview must destroy a giant underwater magnet that is drawing the Moon to the Earth. The crew's efforts are hampered by an intruder capable of changing his appearance.
Nelson deals with frightening illusions and a disappearing crew as he attempts to disarm a superbomb.
Crane and Morton are left stranded on Venus by aliens who are fearful of Earth's progress into space.
Nelson is haunted by the curse of the Flying Dutchman.
The Seaview crew is being entertained by puppet cairactures of the Captain and Admiral, compliments of Professor Multiple. Multiple remains on-board when the sub departs, and his dolls soon come to life, replacing their real-life counterparts. Only Nelson and Crane avoid capture and transformation. Multiple boasts that he and the others are all puppets, created by machines from the future that have traveled into the present, and need the Seaview as a new host body. Can Nelson and Crane overcome this fantastic threat?
The Seaview is being buffeted about by underwater explosions due to the eruption of an active volcano. Dr. Turner (Victor Jory) is aboard to stop the eruptions. However, his true mission is to bring up "elixir stones." An alchemist, Turner needs the stones to keep him immortal. However, in order to bring up the stones, he needs to stimulate the volcano into full eruption!
